Test Fails Due to Dependency on External URL (untrusted-root.badssl.com)

The test should throw DecoderException for handshake failure depends on https://untrusted-root.badssl.com/. I think this causes the test to fail due to a network or DNS error, or an unrelated matter to the actual logic being tested.

Suggested Fix:

Replace the dependency on the external site with a local HTTPS server with a self-signed certificate to simulate an untrusted TLS handshake.